By Anna Prior

RadioShack reported its fourth straight quarterly loss Tuesday as the consumer electronics chain’s overall sales continued to decline. The fourth-quarter miss that included a 7% same-store sales drop shows how last month’s stock surge could show too-early investor optimism about RadioShack and the extent to which new chief executive Joseph Magnacca needs to work to keep the retailer from becoming irrelevant. Shares fall 3.6% to $2.94 premarket.

Assisted Living Concepts agreed to be acquired by private equity firm TPG for $278 million. TPG has offered $12 a share for Class A shares of the Wisconsin-based operator of senior living residences, and the agreement was unanimously approved by Assisted Living’s board of directors. Shares rose 22% to $11.86 premarket.

Caesars’ fourth-quarter loss widened as superstorm Sandy contributed to the casino operator’s revenue shortfall and results were also hurt by significant impairment charges. Shares slid 8.5% to $10.72 premarket as revenue missed analysts’ estimates, although the net loss was within the company’s projections.

Vivus Inc.'s (VVUS) fourth-quarter loss widened as the biopharmaceutical company recorded sharply higher operating expenses. Shares slipped 9.5% to $11.23 premarket as the loss was wider than analysts had expected and as the company reported disappointing sales of its obesity drug, Qsymia.

CommonWealth REIT (CWH) said it is selling 27 million shares to raise funds to repurchase as much as $450 million of senior notes that mature between next year and 2016. The company, which primarily owns office properties, said the debt repurchase plan is conditioned upon the stock sale. However, Corvex Management LP and Related Fund Management LLC unveiled a collectively owned 9.8% stake in the real estate investment trust and called on Commonwealth to cease the equity offer. Shares rose 17% to $18.60 premarket.

MediciNova Inc. (MNOV) said its MN-166 drug as a treatment for methamphetamine dependence has been granted fast-track status by the Food and Drug administration. Shares rose 25% to $2.67 premarket.

For-profit educator Apollo Group Inc. (APOL) said the group that accredits its University of Phoenix recommended the university be placed on probation after determining it is too closely tied to Apollo. Shares fell 1.7% to $17.53 premarket as the recommendation–issued in a draft report related to the university’s ongoing accreditation review–caught investors by surprise.

Enbridge Energy Management LLC (EEQ) has commenced an offering of nine million of its listed shares as the energy company looks to raise funds to repay commercial paper, finance a portion of its capital expansion program and for general partnership purposes. Enbridge had 41.9 million shares outstanding as of Feb. 14. Shares slipped 5.3% to $26.92 premarket.

Radian Group Inc. (RDN) is offering up to 30 million of its shares and $200 million aggregate principal amount of its convertible senior notes due 2019. The mortgage insurer plans to use proceeds from both offerings to fund working capital requirements and for general corporate purposes. Radian had 133.7 million shares outstanding as of Feb. 19. Shares were down 6.1% to $7.65 premarket.

Autodesk Inc.'s (ADSK) fourth-quarter earnings rose 3.5% as the design-software company reported revenue growth excluding currency fluctuations in its Europe/Middle East and Africa segment and its Asia-Pacific business offset declines in the Americas and in emerging economies. Shares were down 2.7% at $35.75 in premarket trading as Autodesk’s first-quarter guidance missed expectations.

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